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CVE-2021-31385

Junos OS: J-Web: A path traversal vulnerability allows an authenticated attacker to elevate their privileges to root

High8.8EPSS 1.5%
Published
Updated
Reserved
Assigned by
juniper

Description

An Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') vulnerability in J-Web of Juniper Networks Junos OS allows any low-privileged authenticated attacker to elevate their privileges to root. This issue affects: Juniper Networks Junos OS 12.3 versions prior to 12.3R12-S19; 15.1 versions prior to 15.1R7-S10; 18.3 versions prior to 18.3R3-S5; 18.4 versions prior to 18.4R3-S9; 19.1 versions prior to 19.1R3-S6; 19.2 versions prior to 19.2R1-S7, 19.2R3-S3; 19.3 versions prior to 19.3R3-S3; 19.4 versions prior to 19.4R3-S5; 20.1 versions prior to 20.1R2-S2, 20.1R3-S1; 20.2 versions prior to 20.2R3-S2; 20.3 versions prior to 20.3R3; 20.4 versions prior to 20.4R2-S1, 20.4R3; 21.1 versions prior to 21.1R1-S1, 21.1R2.

Scores

CVSS scores of CVE-2021-31385, by who scored it
Scored byCVSSScoreVector
juniperCNA (assigner)3.1High8.8CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVDNVD · Modified3.1High8.8CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS (exploitation in 30 days)
1.5% · top 26% of all CVEs (6 Nov 2026)
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.8.

Weakness

Affected products

  • Juniper Networks · Junos OS

    • affected 12.3 – < 12.3R12-S19

  • Juniper Networks · Junos OS

    • affected 15.1 – < 15.1R7-S10
    • affected 18.3 – < 18.3R3-S5
    • affected 18.4 – < 18.4R3-S9
    • affected 19.1 – < 19.1R3-S6
    • affected 19.2 – < 19.2R1-S7, 19.2R3-S3
    • affected 19.3 – < 19.3R3-S3
    • affected 19.4 – < 19.4R3-S5
    • affected 20.1 – < 20.1R2-S2, 20.1R3-S1
    • affected 20.2 – < 20.2R3-S2
    • affected 20.3 – < 20.3R3
    • affected 20.4 – < 20.4R2-S1, 20.4R3
    • affected 21.1 – < 21.1R1-S1, 21.1R2

What to do

Solution: The following software releases have been updated to resolve this specific issue: 12.3R12-S19, 15.1R7-S10, 18.3R3-S5, 18.4R3-S9, 19.1R3-S6, 19.2R1-S7, 19.2R3-S3, 19.3R3-S3, 19.4R3-S5, 20.1R2-S2, 20.1R3-S1, 20.2R3-S2, 20.3R3, 20.4R2-S1, 20.4R3, 21.1R1-S1, 21.1R2, 21.2R1, and all subsequent releases.

Workaround: There are no viable workarounds for these issues other than disabling J-Web. To reduce the risk of exploitation of these issues, use access lists or firewall filters to limit access to only trusted administrative networks, hosts and users.

Exploitation: Juniper SIRT is not aware of any malicious exploitation of this vulnerability.

References (1)

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .